几何结构对电流驱动纳米带内磁斯格明子移动特性的影响  

Effect of Geometric Structure on Current⁃induced Magnetic Skyrmion Motion in Nanostripes

作　　者：张光富 谭伟石 张赛文 文兵 ZHANG Guangfu;TAN Weishi;ZHANG Saiwen;WEN Bing(School of Information and Electronic Engineering,Hunan City University,Yiyang 413000,Hunan,China;All-Solid-State Energy Storage Materials and Devices Key Laboratory of Hunan Province,Yiyang 413000,Hunan,China)

机构地区：[1]湖南城市学院信息与电子工程学院,湖南益阳413000 [2]全固态储能材料与器件湖南省重点实验室,湖南益阳413000

出　　处：《材料导报》2022年第12期39-43,共5页Materials Reports

基　　金：国家自然科学基金(11604091,11547186,11947088);湖南省自然科学基金(2018JJ2019)。

摘　　要：研发新一代自旋电子器件要求精确操控纳米带内磁斯格明子的移动。磁斯格明子存在横向移动且移动速度慢是影响新一代自旋电子器件开发应用的主要因素。基于微磁学模拟研究了不同结构纳米带中磁斯格明子在电流驱动作用下的移动特性。电流驱动纳米带内磁斯格明子移动过程中存在横向移动,因此存在最大的注入电流J_(max)和最大移动速度V_(max)。在矩形纳米带内,J_(max)和V_(max)相对较小。通过裁剪矩形纳米带中央形成凹槽纳米带,J_(max)和V_(max)可显著提高,但反映驱动效率的速度V_(x)与注入电流J的比值(V_(x)/J)不大。提出利用裁剪纳米带边缘形成引导型纳米带来增大V_(x)/J。相对于矩形纳米带,电流驱动的引导纳米带中磁斯格明子移动时,V_(x)/J显著增大,且在一定程度上增大了J_(max)和V_(max)。电流驱动纳米带中磁斯格明子移动的最优方案是集合了引导和凹槽纳米带优势的组合纳米带,可获得更大的电流驱动效率、更大的移动速度。这些研究结果可为开发设计新一代自旋电子器件提供理论依据。Aprecise control of the skyrmion motion is necessary for the research and development of next⁃generation spintronic devices.For the current⁃induced magnetic skyrmion motion,the small skyrmion motion velocity and transverse motion of skrymion are still bottlenecks in the technology application.Current⁃induced skyrmion motion in the nanostripes with different structures were studied based on the micromagnetism simulation.For the current⁃induced skyrmion motion in the nanostripe,there are the _(max)imum injection current J_(max) and _(max)imum velocity V_(max).In the rectangle nanostripe,the J_(max) and V_(max) are relatively small.For the groove nanostripes obtained by the taped the center of rectangle nanostripe,the J_(max) and V_(max) can be significantly increased compared with those of the rectangle nanostripe.However,the ratio of the velocity and injection current density V_(x)/J,which reflects the driving efficiency,is relatively low.It is firstly proposed that guided nanostripe is formed by tapering the edge of nanostripe to improve V_(x)/J.In the guided nanostripe,the V_(x)/J can be significantly increased.The J_(max) and V_(max) have also been increased to some extent.An optimum channel for skyrmions is a combined nanostripe which has the advantages of guided and groove nanopstripe combined.In the combined nanostripe,the V_(x)/J is improved,and a larger current density can be injected to obtain a higher motion velocity.The results give guidance for the design and development of spintronic devices based on nanostripes.

关 键 词：磁斯格明子 纳米带 微磁学模拟 自旋极化电流 自旋电子器件 

分 类 号：O482.51[理学—固体物理]